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<meta name="description" content="1.水平居中行内元素：对父元素设置text-align:center;定宽块状元素: 设置左右margin值为auto;不定宽块状元素:  设置子元素为display:inline,然后在父元素上设置text-align:center;通用方案: flex布局，对父元素设置display:flex;justify-content:center; 2.垂直居中父元素一定，子元素为单行内联文本：设置父">
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          <h1 class="post-title" itemprop="name headline">居中方法整理</h1>
        

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        <h3 id="1-水平居中"><a href="#1-水平居中" class="headerlink" title="1.水平居中"></a>1.水平居中</h3><p>行内元素：对父元素设置text-align:center;<br>定宽块状元素: 设置左右margin值为auto;<br>不定宽块状元素:  设置子元素为display:inline,然后在父元素上设置text-align:center;<br>通用方案: flex布局，对父元素设置display:flex;justify-content:center;</p>
<h3 id="2-垂直居中"><a href="#2-垂直居中" class="headerlink" title="2.垂直居中"></a>2.垂直居中</h3><p>父元素一定，子元素为单行内联文本：设置父元素的height等于行高line-height<br>父元素一定，子元素为多行内联文本：设置父元素的display:table-cell或inline-block，再设置vertical-align:middle;<br>块状元素:设置子元素position:absolute 并设置top、bottom为0，父元素要设置定位为static以外的值，margin:auto;</p>
<p>通用方案: flex布局，给父元素设置{display:flex; align-items:center;}</p>
<h3 id="3-左右布局"><a href="#3-左右布局" class="headerlink" title="3.左右布局"></a>3.左右布局</h3><p>使盒子浮动，或者使用绝对定位等方法<br><strong>浮动布局</strong><br>这种方法是左边浮动，右边加上一个margin-left值，让他实现左边固定，右边自适应的布局效果<br><img src="https://upload-images.jianshu.io/upload_images/11007474-9fc03e183c848da7.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="image.png"></p>
<h3 id="4-上中下布局"><a href="#4-上中下布局" class="headerlink" title="4.上中下布局"></a>4.上中下布局</h3><h4 id="1-float-margin"><a href="#1-float-margin" class="headerlink" title="1. float+margin"></a>1. float+margin</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line">&lt;!DOCTYPE html&gt;</span><br><span class="line">&lt;html lang=&quot;en&quot;&gt;</span><br><span class="line">&lt;head&gt;</span><br><span class="line">    &lt;meta charset=&quot;UTF-8&quot;&gt;</span><br><span class="line">    &lt;title&gt;Title&lt;/title&gt;</span><br><span class="line">    &lt;style type=&quot;text/css&quot;&gt;</span><br><span class="line">        #content&#123;</span><br><span class="line">            height:300px;</span><br><span class="line">        &#125;</span><br><span class="line">        .left&#123;</span><br><span class="line">            width: 200px;</span><br><span class="line">            height:100%;</span><br><span class="line">            float: left;</span><br><span class="line">            background-color: #00a0dc;</span><br><span class="line">        &#125;</span><br><span class="line">        .middle&#123;</span><br><span class="line">            height:100%;</span><br><span class="line">            margin-left:200px;</span><br><span class="line">            margin-right: 300px;</span><br><span class="line">            background-color: red;</span><br><span class="line">        &#125;</span><br><span class="line">        .right&#123;</span><br><span class="line">            height:100%;</span><br><span class="line">            width: 300px;</span><br><span class="line">            float: right;</span><br><span class="line">            background-color: #00a0dc;</span><br><span class="line">        &#125;</span><br><span class="line">    &lt;/style&gt;</span><br><span class="line">&lt;/head&gt;</span><br><span class="line">&lt;body&gt;</span><br><span class="line">&lt;div id=&quot;content&quot;&gt;</span><br><span class="line">    &lt;div class=&quot;left&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;right&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;middle&quot;&gt;&lt;/div&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">&lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre></td></tr></table></figure>
<p><strong>注意：中间的middle元素是content的最后一个元素</strong></p>
<h4 id="2-float-absolute"><a href="#2-float-absolute" class="headerlink" title="2. float+absolute"></a>2. float+absolute</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line">&lt;!DOCTYPE html&gt;</span><br><span class="line">&lt;html lang=&quot;en&quot;&gt;</span><br><span class="line">&lt;head&gt;</span><br><span class="line">    &lt;meta charset=&quot;UTF-8&quot;&gt;</span><br><span class="line">    &lt;title&gt;Title&lt;/title&gt;</span><br><span class="line">    &lt;style type=&quot;text/css&quot;&gt;</span><br><span class="line">        #content&#123;</span><br><span class="line">            position: relative;</span><br><span class="line">            width:100%;</span><br><span class="line">            height:300px;</span><br><span class="line">        &#125;</span><br><span class="line">        .left&#123;</span><br><span class="line">            float: left;</span><br><span class="line">            width: 200px;</span><br><span class="line">            height:100%;</span><br><span class="line">            background-color: #00a0dc;</span><br><span class="line">        &#125;</span><br><span class="line">        .middle&#123;</span><br><span class="line">            position: absolute;</span><br><span class="line">            top:0;</span><br><span class="line">            bottom:0;</span><br><span class="line">            left:200px;</span><br><span class="line">            right: 300px;</span><br><span class="line">            background-color: red;</span><br><span class="line">        &#125;</span><br><span class="line">        .right&#123;</span><br><span class="line">            float: right;</span><br><span class="line">            height:100%;</span><br><span class="line">            width: 300px;</span><br><span class="line">            background-color: #00a0dc;</span><br><span class="line">        &#125;</span><br><span class="line">    &lt;/style&gt;</span><br><span class="line">&lt;/head&gt;</span><br><span class="line">&lt;body&gt;</span><br><span class="line">&lt;div id=&quot;content&quot;&gt;</span><br><span class="line">    &lt;div class=&quot;left&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;middle&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;right&quot;&gt;&lt;/div&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">&lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre></td></tr></table></figure>
<h4 id="3-display-box-box-flex-1"><a href="#3-display-box-box-flex-1" class="headerlink" title="3. display:box;box-flex:1"></a>3. display:box;box-flex:1</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line">&lt;!DOCTYPE html&gt;</span><br><span class="line">&lt;html lang=&quot;en&quot;&gt;</span><br><span class="line">&lt;head&gt;</span><br><span class="line">    &lt;meta charset=&quot;UTF-8&quot;&gt;</span><br><span class="line">    &lt;title&gt;Title&lt;/title&gt;</span><br><span class="line">    &lt;style type=&quot;text/css&quot;&gt;</span><br><span class="line">        #content&#123;</span><br><span class="line">            height:300px;</span><br><span class="line">            display:-webkit-box;</span><br><span class="line">        &#125;</span><br><span class="line">        .left&#123;</span><br><span class="line">            width: 200px;</span><br><span class="line">            height:100%;</span><br><span class="line">            background-color: #00a0dc;</span><br><span class="line">        &#125;</span><br><span class="line">        .middle&#123;</span><br><span class="line">            min-width:200px;</span><br><span class="line">            -webkit-box-flex: 1;</span><br><span class="line">            height:100%;</span><br><span class="line">            background-color: red;</span><br><span class="line">        &#125;</span><br><span class="line">        .right&#123;</span><br><span class="line">            height:100%;</span><br><span class="line">            width: 300px;</span><br><span class="line">            background-color: #00a0dc;</span><br><span class="line">        &#125;</span><br><span class="line">    &lt;/style&gt;</span><br><span class="line">&lt;/head&gt;</span><br><span class="line">&lt;body&gt;</span><br><span class="line">&lt;div id=&quot;content&quot;&gt;</span><br><span class="line">    &lt;div class=&quot;left&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;middle&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div class=&quot;right&quot;&gt;&lt;/div&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">&lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre></td></tr></table></figure>
<h4 id="4-display-flex-flex-1"><a href="#4-display-flex-flex-1" class="headerlink" title="4. display:flex;flex:1"></a>4. display:flex;flex:1</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line">&lt;!DOCTYPE html&gt;</span><br><span class="line">&lt;html&gt;</span><br><span class="line"></span><br><span class="line">&lt;head&gt;</span><br><span class="line">    &lt;meta charset=&quot;UTF-8&quot;&gt;</span><br><span class="line">    &lt;title&gt;&lt;/title&gt;</span><br><span class="line">    &lt;style type=&quot;text/css&quot;&gt;</span><br><span class="line">        *&#123;</span><br><span class="line">            margin: 0;</span><br><span class="line">            padding: 0;</span><br><span class="line">        &#125;</span><br><span class="line">        #content &#123;</span><br><span class="line">            display: flex;</span><br><span class="line">            width: 100%;</span><br><span class="line">            height: 200px;</span><br><span class="line">        &#125;</span><br><span class="line">        #left &#123;</span><br><span class="line">           flex:0 0 200px;</span><br><span class="line">            height: 100%;</span><br><span class="line">            background-color: #f04d0d;</span><br><span class="line">        &#125;</span><br><span class="line">        #middle&#123;</span><br><span class="line">            flex: 1;</span><br><span class="line">            background-color: blue;</span><br><span class="line">        &#125;</span><br><span class="line">        #right &#123;</span><br><span class="line">            flex:0 0 200px;</span><br><span class="line">            height: 100%;</span><br><span class="line">            background-color: #f04d0d;</span><br><span class="line">        &#125;</span><br><span class="line">    &lt;/style&gt;</span><br><span class="line">&lt;/head&gt;</span><br><span class="line"></span><br><span class="line">&lt;body&gt;</span><br><span class="line">&lt;div id=&quot;content&quot;&gt;</span><br><span class="line">    &lt;div id=&quot;left&quot;&gt; &lt;/div&gt;</span><br><span class="line">    &lt;div id=&quot;middle&quot;&gt;&lt;/div&gt;</span><br><span class="line">    &lt;div id=&quot;right&quot;&gt;&lt;/div&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line">&lt;/body&gt;</span><br><span class="line">&lt;/html&gt;</span><br></pre></td></tr></table></figure>

      
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